<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            background-color: red;
            margin: 10px;
        }
        .a {
            width: auto;
            margin-right: 250px;
            margin-left: auto;
        }
        .b {
            float: right;
            width: 110px;
        }
        .c {
            float: right;
        }
    </style>
</head>
<body>

<div class="b">bv</div>
<div class="c">c</div>
<div class="a">a</div>


</body>
</html>